James a



(Model)- J. A. GIESE.

KNOB ATTACHMENT.

Patented Feb; 21,1082.

iii/07" 11 6716' UNITED STATES PATENT ()FFIcE.

JAMES A. GIESE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE UNIOE BRASS MANUFACTURING GOMPANY, OF SAME PLACE.

KNOB ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 254,000, dated February 21, 1882.

Application filed September 10, 1881.

To all whom it may concern:

Be it known that I, JAMES A. Grnsn, a citizen of the United States, residing at Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful My invention relates to door-latches, the

latches proper of which are operated by the rotary motion of knobs.

My invention consists of means for securing one of the knobs to the'latch-case. V

In the drawings, A represents a door-latch embodying my improvements. The fixed part b of the shank of the knob B is divided into two sections, I) b, by a deep channel or groove. A shaft, D is inserted through the sections 12 b, crossing said channel and passing through and forming a pivot for the arms 0 G of said shank. The shank of the knob B, (which term shank includes the fixed partb and the branches of said shank, which have been described as the arms (J 0,) after pressing the arms together, is inserted into the latch-case D through a small opening, D such as is usual for this purpose. Thereupon the arms are spread apart by the manipulator, (the inside plate, D, of the latch-case not being as yet secured in place,) their shoulders c c resting on a circular step reamed out of the inside surface of the latch -case, though the (ModeL) the wedge and over the ends of and between the arms, as shown in dotted lines in Fig. 2, the channeled collar thus acting as a key or strut to hold the arms apart, a lock to hold the wedge down in place, and afollower to insure the simultaneous rotation of thespindle F and the branching knob-shank. This collar f is adapted in depth to rest upon the inside plate of the latch-ease when that is screwed on. The arms also serve as lugs to operate the talon-frame G.

The wedge E may be fastened to and form a part of the collar f. Its function in any case is that of a key or strut to hold the arms apart.

As the collar f answers the same purpose, the wedge or key E is desirable only as makinga longer bearing-surface to receive the wear occasioned by the slight movement back and forth of the knob-shank-an important consideration in a lock especially designed, as is this, for use on railway-carriages.

Theborders of the perforation D of thelatchcase, through which perforation the knob is inserted into said case, serve to oppose the withdrawal oftheknob-shank whenitsbranches are held in their separated position.

By the above construction of a door-latch the cost of the apparatus is reduced,thelatchcase is adapted to be taken entirely to pieces for repairs, and the shank of the pulling-knob has aseat within the case of hard metal, whereas in other latch-cases it is common to secure thisknob by Babbitt metal, which in such cases forms the base against which it turns in pullmg.

Having thus described my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

.The combination, with a latch-case, of the fixed part b of the knob-shank, the pivoted arms 0 O, and the collar f, holding the arms apart, substantially as set forth.

JAMES A. GIESE.

Witnesses Jno. O. MACGREGOR,

W. G. CORLIES. 

